Texas Instruments 74AVCH4T245QPWRQ1

Overview

74AVCH4T245QPWRQ1 from Texas Instruments is an automotive-grade 4-bit dual-supply bus transceiver enabling bidirectional level-shifting between 1.08V and 3.6V voltage domains. It features independent VCCA and VCCB rails, 500Mbps data rate support, Ioff partial-power-down protection, and integrated bus-hold on all data inputs-used in ADAS domain controllers for translating between 1.8V sensor interfaces and 3.3V MCU buses.

For engineers reviewing the 74AVCH4T245QPWRQ1 datasheet, 74AVCH4T245QPWRQ1 pinout, 74AVCH4T245QPWRQ1 application, or 74AVCH4T245QPWRQ1 equivalent, key selection criteria include dual-rail voltage translation range (1.08V–3.6V), A/B-port direction control logic, 16-pin TSSOP thermal performance (RθJA = 112°C/W), and automotive AEC-Q100 Grade 1 qualification (–40°C to +125°C).

Technical Context

The 74AVCH4T245QPWRQ1 implements a fully configurable dual-rail architecture where A-port I/Os track VCCA (1.08V–3.6V) and B-port I/Os track VCCB (1.08V–3.6V); control inputs (DIR, OE) are referenced solely to VCCA. Its noninverting bidirectional logic uses separate DIR and OE signals per 2-bit channel to select data flow direction (A→B or B→A) or place both ports in high-impedance isolation mode.

It integrates bus-hold circuitry on all eight data I/Os-eliminating external pull resistors-and supports VCC isolation: if either VCCA or VCCB falls below 0.4V, both ports enter high-Z state. Ioff functionality limits current backflow during partial power-down, meeting JESD78 Class II latch-up immunity (>100mA).

Key Specifications

Pinout & Package

Packaged in a 16-pin TSSOP (PW) with 5mm × 6.4mm footprint and 0.65mm lead pitch, optimized for automated SMT assembly and thermal management in space-constrained automotive modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus transceiver applications.

Compared with SN74LVC4T245QPWRQ1 and NLSX4014DR2G, the 74AVCH4T245QPWRQ1 uniquely combines 1.08V operation, integrated bus-hold, and AEC-Q100 Grade 1 qualification-making it the sole option for next-generation automotive MCUs with sub-1.2V I/O standards and zero-resistor design constraints.

Availability

74AVCH4T245QPWRQ1 is available at Aetrix Electronics and suitable for ADAS camera interfaces, automotive infotainment SoC interconnects, and body control module gateways requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AVCH4T245QPWRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and automotive ICs, with decades of automotive qualification expertise and broad AEC-Q100 portfolio coverage.

The 74AVCH4T245QPWRQ1 belongs to TI's AVC logic family-designed specifically for low-voltage, high-speed bidirectional translation in automotive and industrial systems demanding robustness, precision timing, and mixed-supply interoperability.

FAQ

What voltage levels can 74AVCH4T245QPWRQ1 translate between?

The 74AVCH4T245QPWRQ1 supports bidirectional level translation between any combination of 1.08V, 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains-because its A port tracks VCCA (1.08V–3.6V) and B port tracks VCCB (1.08V–3.6V), independently. This allows direct interfacing of legacy 5V-tolerant peripherals with modern ultra-low-voltage MCUs without external resistors or dedicated level-shifter ICs. The 74AVCH4T245QPWRQ1 achieves this via internal rail-referenced input thresholds and output drivers.

How does 74AVCH4T245QPWRQ1 handle power sequencing when VCCA and VCCB ramp at different rates?

The 74AVCH4T245QPWRQ1 incorporates VCC isolation: if either VCCA or VCCB falls below 0.4V, both A and B ports automatically enter high-impedance state-preventing false logic states or bus contention during asymmetric power-up/down. This behavior is guaranteed across –40°C to +125°C and eliminates need for external power-good sequencing logic. The 74AVCH4T245QPWRQ1 also uses Ioff to block back-current when one supply is off and the other is active.

Does 74AVCH4T245QPWRQ1 require external pull-up or pull-down resistors on its data lines?

No-74AVCH4T245QPWRQ1 integrates active bus-hold circuitry on all eight data I/Os (1A1–2A2, 1B1–2B2), which maintains unused or undriven inputs at valid logic HIGH or LOW states. TI explicitly advises against adding external pull resistors, as they conflict with bus-hold operation and may increase power consumption or cause metastability. This feature reduces BOM count and improves reliability in automotive modules where connector open-circuits are possible.

What is the maximum data rate supported by 74AVCH4T245QPWRQ1, and under what conditions?

The 74AVCH4T245QPWRQ1 supports up to 500Mbps data rate when translating between 1.08V and 3.3V domains-verified in TI's characterization labs per JEDEC JESD65B. Real-world throughput depends on load capacitance, trace length, and VCCA/VCCB values: propagation delay drops to 1.2ns at 3.3V/3.3V, but increases to 3.5ns at 1.2V/3.3V. Signal integrity must be validated per application; the 74AVCH4T245QPWRQ1 itself imposes no protocol-level limitation beyond its electrical specs.

Is 74AVCH4T245QPWRQ1 qualified for automotive use, and what standards does it meet?

Yes-the 74AVCH4T245QPWRQ1 is AEC-Q100 Grade 1 qualified (–40°C to +125°C ambient), with full automotive PPAP documentation available. It meets JESD78 Class II latch-up immunity (>100mA), JESD22-A114 (±8000V HBM), JESD22-A115 (±200V MM), and JESD22-C101 (±1000V CDM) ESD standards. These qualifications are verified per TI's SCES967 datasheet and apply to the exact 74AVCH4T245QPWRQ1 device shipped in PW (TSSOP-16) packaging.